The purpose of the study was to describe the effectiveness of communication and service behaviour at Army Hospital (AH) East Java. The population in this study were 500 employees of AH East Java. Samples were taken using a random sampling technique. Based on the results of Slovin's calculation, the sample size is 183 people. The analysis technique in this study uses a description of the SPSS program. The results of this study indicate that the effectiveness of communication can create service behaviour for AH East Java employees, meaning the ability of employees to communicate effectively, Openness, supportive attitude, positive attitude, and Empathy. Effectiveness Communication is a two-way interaction that is supportive, positive, open and empathetic by individual goals. In Effectiveness of Communication to improve service behaviour and employee performance includes Openness, Supportiveness, and Positivity. Communication Effectiveness is a construct built from observation indicators: Openness, Supportiveness, and Positivity. First, Openness to the Army Hospital in East Java employees is carried out through transparent and respectful communication between employees working at the Army Hospital in East Java. The high average value indicates this, and the average Openness has a higher average value. Service behaviour is a commendable attitude for someone in control of serving something that is the desire of others.